Assessing video content transmitted over networked content infrastructures becomes a fundamental requirement for
service providers. Previous research has shown that there is no direct correlation between traditional network QoS and
user perceived video quality. This paper presents a study investigating the impact of individual packet loss on four types
of H.264 main-profile encoded video streams. Four artifact factors to model the degree of artifacts in video frames are
defined. Further, the visibility of artifacts considering the video content characteristics, encoding scheme and error
concealment is investigated in conjunction with a user study. The individual and joint impacts of artifact factors are
explored on the test video sequences. From the results of user tests, the artifact factor-based assessment method shows
superiority over PSNR-based and network QoS based quality assessment.
The quality of service for latency dependent content, such as video streaming, largely depends on the distance and available bandwidth
between the consumer and the content. Poor provision of these qualities results in reduced user experience and increased overhead. To
alleviate this, many systems operate caching and replication, utilising dedicated resources to move the content closer to the consumer.
Latency-dependent content creates particular issues for community networks, which often display the property of strong internal
connectivity yet poor external connectivity. However, unlike traditional networks, communities often cannot deploy dedicated
infrastructure for both monetary and practical reasons. To address these issues, this paper proposes Corelli, a peer-to-peer replication
infrastructure designed for use in community networks. In Corelli, high capacity peers in communities autonomously build a
distributed cache to dynamically pre-fetch content early on in its popularity lifecycle. By exploiting the natural proximity of peers in
the community, users can gain extremely low latency access to content whilst reducing egress utilisation. Through simulation, it is
shown that Corelli considerably increases accessibility and improves performance for latency dependent content. Further, Corelli is
shown to offer adaptive and resilient mechanisms that ensure that it can respond to variations in churn, demand and popularity.
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